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The occurrence of misalignment of internal teeth during the operation of a CNC lathe is usually caused by changing the pitch. This is mainly because changing the pitch formula will also change accordingly. If the internal tooth formula is not changed in a timely manner, it is extremely easy to cause misalignment of internal teeth. Today, our CNC lathe manufacturer will explain the treatment method for misalignment of internal teeth caused by changing the pitch of a CNC lathe.
If you change z3 to z6 with a pitch of 3, the teeth will not become messy. If it is not a pitch, the teeth will become messy. The positioning remains unchanged and will not cause tooth misalignment. Changing the z-value in G76 only changes the effective thread engagement length. There is a spindle encoder on the spindle, which detects data that is processed by CNC calculation and then transmits the calculated cutting data to the servo motor for cutting. Therefore, tooth disorder refers to the spindle rotating once without following up with the cutting by a pitch at any time. According to the formula: F=S * P, where P is the pitch, the encoder detects the position and speed, and adjusts the spindle according to the feed position at any time. A thread without a standard pitch is a coarse thread with a standard triangular thread. The calculation method for small diameter on a CNC lathe is d-13P, where d is the nominal diameter, which is the major diameter of the thread, and p is the pitch. Due to the molding of the material, the nominal diameter is generally machined to be 0.2 to 0.3 millimeters smaller than the actual size. The data on the first floor are all of the same nominal diameter and maximum pitch, so it is acceptable.
The lathe has a spindle encoder on the spindle, which detects data that is processed by CNC calculation and then transmits the calculated cutting data to the servo motor for cutting. Therefore, tooth misalignment is when the spindle rotates once and the cutting does not follow up with a pitch at any time. According to the formula: F=S * P, where P is the pitch, the encoder detects the position and velocity, and is always based on the feed position. The height of the original triangle is H=0866P. Tooth height (working height) H=05413P. Internal thread large diameter D - internal thread (nominal diameter). External thread large diameter d - external thread (nominal diameter). Internal thread diameter D=D-06495P. The diameter of the external thread is d=d-06495P. Internal thread small diameter D=D-10825P.
Answer: Currently, most of the threads we work on are uniform threads, which means triangular connecting threads with a tooth profile angle of 60 °, as well as trapezoidal threads with a tooth profile angle of 30 °. In thread machining, the choice of blade is also very important. There are many types of blades, such as full tooth type and universal type. Full tooth type is a specialized type that can only handle this type of thread, while universal type is more suitable. The standard coefficient in books is 06495, but in practical operation, 065 is generally used, which is relatively simple. It doesn't need to be so precise, so the formula is, base diameter=nominal diameter+-0.065 * pitch * 2. The final size of M50 * 3 external teeth is 50-065 * 3 * 2=461 internal teeth 50+065 * 3 * 2=539, which is only for reference.
The above is the method for handling internal tooth misalignment caused by changing the pitch of a CNC lathe, which has been compiled and released by our CNC lathe manufacturer. We hope that the above explanation can be helpful for everyone in dealing with internal tooth errors in the future.